Section A
Q1.
(a) State the process of radioactive decay on geologic source of gamma-ray radiation.
(b) Discuss radioactive nuclei produced by the neutron flux.
(c) Compute reflection and transmission coefficients of two-layer crustal model with the following parameters : Density of crustal layer-1 and layer-2 are 2.0 \text g/cm^3 and 2.5 \text g/cm^3, respectively. P-wave velocity in layer-1 and layer-2 are 2.5 km/s and 4.0 \text km/s, respectively.
(d) Why are free-air gravity anomaly and heat flow across a subducting plate boundary generally found to be low followed by high? Explain it using labelled diagram.
(e) What do you understand by Dirac delta function? Explain it in terms of testing function.
(f) Describe inverse z-transform. Derive the expressions for inverse z-transform using different methods.
(g) What do you understand by path length and path radiance? Explain path radiance in the light of total radiance reaching the sensor.
(h) What are the factors affecting designing of a sensor in remote sensing? Describe various sensors available in IRS-1A.
(i) Discuss the principle of three-channel gamma-ray spectrometer.
